Add pipeline_ref and pipeline_sha claims to Ci::JwtV2

What does this MR do and why?

Field	Description
pipeline_ref	Fully qualified reference to the pipeline definition, defaults to .gitlab-ci.yml. May point to an arbitrary HTTP remote depending on project configuration.
pipeline_sha	Git commit SHA for the pipeline_ref (only populated when pipeline_ref is local to the GitLab instance).

Related to #404722 (closed)

Screenshots or screen recordings

  "pipeline_ref": "https://gitlab.example.com/my-group/my-project/-/blob/714a629c0b401fdce83e847fc9589983fc6f46bc/.gitlab-ci.yml",
  "pipeline_sha": "714a629c0b401fdce83e847fc9589983fc6f46bc",

How to set up and validate locally

build = Ci::Build.last
Gitlab::Ci::Jwt.new(build, ttl: 1.hour).payload
Gitlab::Ci::JwtV2.new(build, aud: 'my-aud', ttl: 1.hour).payload

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.